Re: STAR TREK INTO DARKNESS - Grading & Discussion [SPOILERS]
Pulaski's rapid aging was caused by experimentation with genetic manipulation, whereas "The Deadly Years" was an alien virus, if I remember correctly. Just because both stories resulted in rapid aging doesn't make it a rehash.
Episodes that cover similar ground are, essentially, rehashes.
"...the most elementary and valuable statement in science, the beginning of wisdom, is I do not know." - Lt. Commander Data, "Where Silence Has Lease"